64020042 has 12 divisors (see below), whose sum is σ = 138710130. Its totient is φ = 21340008.

The previous prime is 64020031. The next prime is 64020067. The reversal of 64020042 is 24002046.

64020042 is a `hidden beast` number, since 640 + 20 + 0 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 57471561 + 6548481 = 7581^2 + 2559^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 3556669 = 64020042 / (6 + 4 + 0 + 2 + 0 + 0 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 64019997 and 64020024.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1778317 + ... + 1778352.

Almost surely, 2^64020042 is an apocalyptic number.

64020042 is an abundant number, since it is smaller than the sum of its proper divisors (74690088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64020042 is a wasteful number, since it uses less digits than its factorization.

64020042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556677 (or 3556674 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 64020042 is about 8001.2525269485. The cubic root of 64020042 is about 400.0417498089.

Adding to 64020042 its reverse (24002046), we get a palindrome (88022088).

The spelling of 64020042 in words is "sixty-four million, twenty thousand, forty-two".